@conferenceObjectPart{RoggendorfSchmidt_1989,
title={Sol-gel processing : an alternative way to glasses for optoelectronics},
author={Roggendorf, Hans and Schmidt, Helmut K.},
isbn={0-8194-0164-1},
doi={http://dx.doi.org/10.22028/D291-24358},
year={1989}
}